Kozin, I (Igor) wrote:
>> real codes that computes a minimum. However, an alltoall on many
>> cores/nodes would exercise the same metric (many sends/recvs on the same
>> NIC at the same time), but would be harder to cheat and be much more
>> meaningful IMHO.
>>>> Could not agree more. We are certainly seeing that Alltoall
> is probably the third (after Stream Triad and PingPong) metric
> you want to know about your system in order to predict/assess real
> application performance.
> Exchange in IMB/PMB should also be mentioned. It reflects the needs
of the Halo exchange algorithms that Greg referred to.
rbw
> --
>> Richard B. Walsh
>> Project Manager
> Network Computing Services, Inc.
> Army High Performance Computing Research Center (AHPCRC)
>rbw at ahpcrc.org | 612.337.3467
>> >
> > "The world is given to me only once, not one existing and one
> > perceived. The subject and object are but one."
> >
> > Erwin Schroedinger
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